[webrtc-stats] outbound-rtp prose nomatively references obsolete stat to solve a problem (#644)

jan-ivar has just created a new issue for https://github.com/w3c/webrtc-stats:

== outbound-rtp prose nomatively references obsolete stat to solve a problem ==
[outbound-rtp](https://w3c.github.io/webrtc-stats/#dom-rtcstatstype-outbound-rtp) says: _"When there are multiple [RTP stream](https://w3c.github.io/webrtc-stats/#dfn-rtp-stream)s connected to the same sender due to using simulcast, there will be one [RTCOutboundRtpStreamStats](https://w3c.github.io/webrtc-stats/#dom-rtcoutboundrtpstreamstats) per [RTP stream](https://w3c.github.io/webrtc-stats/#dfn-rtp-stream), with distinct values of the [ssrc](https://w3c.github.io/webrtc-stats/#dom-rtcrtpstreamstats-ssrc) member, and all these streams will have a reference to the same "[track](https://w3c.github.io/webrtc-stats/#dom-rtcstatstype-track)" object (of type [RTCMediaStreamTrackStats](https://w3c.github.io/webrtc-stats/#dom-rtcmediastreamtrackstats))."_

This normative statement is incorrect because [track](https://w3c.github.io/webrtc-stats/#dom-rtcstatstype-track) _"is now obsolete."_

It might work to instead say they'll have the same [mid](https://w3c.github.io/webrtc-stats/#dom-rtcoutboundrtpstreamstats-mid).

This is a recent regression from https://github.com/w3c/webrtc-stats/pull/628.

Please view or discuss this issue at https://github.com/w3c/webrtc-stats/issues/644 using your GitHub account


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